[ubuntu] Cannot install on USB drive

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I've been trying to make a USB flash key to boot from as an experiment/something to play with. So far, the experiment has gone poorly. (For the record, I already dual boot Ubuntu and Windows ok, I really just want to be able to this USB thing.)
My issue: I tried following the instructions here on this web page: http://www.howtogeek.com/howto/linux...-the-easy-way/
Seemed like the most straightforward way to do what I wanted to do. I have the latest LTS ISO (12.04), which is what I'm trying to use. When it starts writing to the USB drive, it stalls at ~5% and throws and error that the vol
(Hardware)